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makvit [3.9K]
3 years ago
14

The probability that Paula passes Mathematics is 2/3, and the probability that she passes English is 4/9. If the probability tha

t she passes both courses is 1/4, what is the probability that she will pass at least one course?
Mathematics
1 answer:
Anestetic [448]3 years ago
8 0

Answer:

31/36

Step-by-step explanation:

P(E or M) = P(E) + P(M) - P(E & M)

= (2/3) + (4/9) - (1/4)

= 31/36

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The hypotenuse of a right triangle is 6 cm and one side is 2 cm longer than the other side. Find the length of each side to one
MA_775_DIABLO [31]

Answer:

The two legs of the right triangle are approximately 3.1 cm and 5.1 cm and the hypotenuse is 6 cm.

Step-by-step explanation:

Let <em>x</em> be one leg of the right triangle.

Since the other leg is two centimeters longer, it can be represented by the expression:

x + 2 \text{ cm}

According to the Pythagorean Theorem, for a right triangle:

a^2 + b^2 = c^2

Where <em>c</em> is the hypotenuse and <em>a</em> and <em>b</em> are the two legs.

The hypotenuse is given to be 6 cm and the two legs are <em>x</em> and (<em>x</em> + 2). Hence:

(x)^2 + (x+2)^2 = 6^2

Solve for <em>x</em>. Simplify:

x^2 + (x^2 + 4x + 4) = 36

Simplify:

2x^2 + 4x + 4 = 36

Subtract:

2x^2 + 4x - 32 =0

Divide:

x^2 + 2x - 16 = 0

The equation is not factorable, so we can consider using the quadratic formula:

\displaystyle x = \frac{-b\pm\sqrt{b^2 -4ac}}{2a}

In this case, <em>a</em> = 1, <em>b</em> = 2, and <em>c</em> = -16. Substitute:

\displaystyle x= \frac{-(2)\pm\sqrt{(2)^2-4(1)(-16)}}{2(1)}

And evaluate:

\displaystyle \begin{aligned}x &= \frac{-2\pm\sqrt{68}}{2} \\ \\ &= \frac{-2\pm\sqrt{4\cdot 17}}{2} \\ \\ &= \frac{-2\pm2\sqrt{17}}{2} \\ \\ &= -1 \pm \sqrt{17} \end{aligned}

Hence, our two solutions are:

\displaystyle x = -1 + \sqrt{17} \approx 3.1\text{ or } x = -1 - \sqrt{17} \approx -5.1

Lengths cannot be negative, so we can ignore the second solution.

Hence, the value of <em>x</em> or the first side length is about 3.1 centimeters.

Since the other side length is two centimeters longer, the other side is about 5.1 centimeters.

In conclusion, the two legs of the right triangle are approximately 3.1 cm and 5.1 cm and the hypotenuse is 6 cm.

4 0
3 years ago
Can someone help please ?
Temka [501]
Number line 3..............
4 0
3 years ago
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What value is the 4 in number 358.547
TiliK225 [7]

Answer:

Hundredths place

Step-by-step explanation:

3 is hundred

5 is ten

8 is ones

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5 is tenths

4 is hundredths

7 is thousandths

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3 years ago
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Cost of a sled:$99.50 the markup is 95% what is the answer
Bezzdna [24]
$99.50 * 0.95 = $94.53
$99.50 - $94.53 = $4.97
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3 years ago
Jim has three times as many comic books as Charles.Charles has 2\3 as many books as Bob.Bib has 27 books. How many comic books d
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He has 54 books jim         54 is the nswer


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